Yes, constructed the honeypot URL using the proxy site and called it (thousands of times) so I can get them to fetch it from my server through their IP so I can log it.
They literally proxy your website? I thought they'd cache it... that makes more sense now in your statement that you hit their website with a specially formatted url. Since they pass that through to you you can filter on that.
Also: since you say 4k-5k IPs... any of them from cloud providers? And specific location?
I didn't do it as a super quick burst, but in a space of multiple hours.
First because the proxy servers were super slow and second - I couldn't automate it - their servers had some kind of bot detection which would catch me calling the URLs through script.
Instead, I installed a browser extension which would automatically reload a browser tab after specified timeout (I've set it to 10 sec or something) and I opened like 50 tabs of the honeypot URL and left it there to reload for hours ...